In Google Apps for Education, there is also have the option of creating an email alias without the need of another account.
For example, my account is user@domain.org. With email aliases, I can have e-mail sent to alias1@domain.org, alias2@domain.org, alias3@domain.org, etc. all come to user@domain.org. See these Google Apps Support Docs.

As far as forwarding from one actual account to another, you are limited to receiving mail from only one other account. See this.

It's a quick and easy setup, but it does have to be done by an Administrator.

For the free Google Apps account (which they're not giving away anymore) you have to burn a user account for this, as these accounts do not come with mail routing. Create a user account, then setup mail forwarding.